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Can we write functions in shell script?
One often-overlooked feature of Bourne shell script programming is that you can easily write functions for use within your script. This is generally done in one of two ways; with a simple script, the function is simply declared in the same file as it is called.
What are the shell functions?
Shell functions are a way to group commands for later execution using a single name for the group. They are executed just like a “regular” command. When the name of a shell function is used as a simple command name, the list of commands associated with that function name is executed.
How are functions declared in a shell script?
This is generally done in one of two ways; with a simple script, the function is simply declared in the same file as it is called. However, when writing a suite of scripts, it is often easier to write a “library” of useful functions, and source that file at the start of the other scripts which use the functions. This will be shown later .
How to import shell functions from one file into another?
Longer answer: when you call script with bash -c, a child process is created. This child process sees all exported variables (including functions) from parent process. But not vice versa. So, your script will never see comex function. Instead you need to include script code directly in current script and you do so by using . or source commands.
What are the different types of shell functions?
Functions that terminates the shell script using the ‘exit’ keyword. You can use the exit keyword to terminate the script based on certain conditions. 3. Functions that change the value of a variable/variables.
What’s the difference between function and procedure in a shell script?
Functions. A procedure, on the other hand, does not return a value, but may produce output. A shell function may do neither, either or both. It is generally accepted that in shell scripts they are called functions.